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ballcock
Sepang


Joined: 21 Jul 2008
Posts: 2959
Location: Dublin

1996 Porsche 993 Carrera 2

PostPosted: Fri Feb 15, 2019 8:06 am    Post subject: Pattern Part Header Tank Problems. Reply with quote

Morning all,
I had a replacement header tank fitted recently , it came from a respected Porsche parts supplier (no names!) so I assumed the pattern part would work fine.
Not so it seems... I lost about a litre of coolant thru the filler yesterday and the cap will not tighten properly when the coolant is warm. It feels like the threads have gone on the header tank neck.
Has anyone else had a similar experience?
_________________
'96 Iris C2 vario manual coupe, Koni FZD's/M033's RSR's and HID's.
‘98 Ocean blue 996 C2 Tip pressed into daily service.

Ex '83 W460 LWB G Wagen updated with OM602 engine and 6 speed 'box
Ex. '99 996 C2 manual coupe.
 
  
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ballcock
Sepang


Joined: 21 Jul 2008
Posts: 2959
Location: Dublin

1996 Porsche 993 Carrera 2

PostPosted: Sat Feb 16, 2019 6:55 pm    Post subject: Reply with quote

Just a quick update on this, I’ve tried a couple of times (coolant hot and cool) to tighten the cap to the coolant tank neck.
It’s only tightening so far and then it runs to loose again! .. as if the threads are broken.
both tank and cap are new (cap is a .04 )

Reading up on it, apparently it can be quite difficult to seal new caps, and rennlist suggests using silicone spray on the threads, this hasn’t helped.
The car is unusable as the coolant is boiling over as soon as it reaches temperature.
Has no one else come across this?
_________________
'96 Iris C2 vario manual coupe, Koni FZD's/M033's RSR's and HID's.
‘98 Ocean blue 996 C2 Tip pressed into daily service.

Ex '83 W460 LWB G Wagen updated with OM602 engine and 6 speed 'box
Ex. '99 996 C2 manual coupe.
 
  
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6506
Location: Brighton


PostPosted: Sat Feb 16, 2019 7:08 pm    Post subject: Reply with quote

well yes an no .. the plastic thread if damaged will cause this but so it will if its the cap ..

The only thing i can suggest .. turn the cap on the bottle as if you were undoing it .. when it " clicks " and you feel it drop then do it up .

i doubt this will work but it will line up the threads spot on .

other than this ill have to assume one of the threads is damaged .

You already know not to drive it untill its fixed .. it will dump coolant .


Awww just a thought .. have a good look at the rubber seal inside the coolant cap .. i had one a few weeks ago were it didnt sit flat .. it was kinda caught on the threads , gave it a curved look .. a screwdriver to push it in place and it worked .
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ballcock
Sepang


Joined: 21 Jul 2008
Posts: 2959
Location: Dublin

1996 Porsche 993 Carrera 2

PostPosted: Sat Feb 16, 2019 7:25 pm    Post subject: Reply with quote

Thanks DM I’ll have another look at the seal on the cap but I’m pretty sure it’s seated properly.
Other than that it’s back to buying another header tank and cap Rolling Eyes

A quick question on this, would over pressure from the engine (start of a head leak) cause the cap to break thru the threads? I’m not trying to be a doom sayer but thought I’d mention!
I would assume that the relief valve would open before this would happen anyway.. assuming the relief valve is functioning properly!
_________________
'96 Iris C2 vario manual coupe, Koni FZD's/M033's RSR's and HID's.
‘98 Ocean blue 996 C2 Tip pressed into daily service.

Ex '83 W460 LWB G Wagen updated with OM602 engine and 6 speed 'box
Ex. '99 996 C2 manual coupe.
 
  
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6506
Location: Brighton


PostPosted: Sat Feb 16, 2019 7:35 pm    Post subject: Reply with quote

Erm .. no .

You want a quick check ? leave the coolant cap off and start the engine .. if you get the coolant pour out of the coolant tank within seconds then you have a headgasket fault .

it will normally take a good few mins for the lvl to raise a bit ..

When we fill these with coolant we get someone to rev them at 3K rpm .. we then top up coolant and fit the cap beforedropping the revs ..

If a head gasket had failed then we would have water in our faces !


Basically a headgasket fault is very rare .. and unfortunatly it normally ends with D chunk as water has got into the cylinder and hydrauliced the engine .. broken linner basically .

Im in the .. its not headgasket camp atm .
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ballcock
Sepang


Joined: 21 Jul 2008
Posts: 2959
Location: Dublin

1996 Porsche 993 Carrera 2

PostPosted: Sat Feb 16, 2019 7:44 pm    Post subject: Reply with quote

Brilliant!
Thanks a mil for that DM.
_________________
'96 Iris C2 vario manual coupe, Koni FZD's/M033's RSR's and HID's.
‘98 Ocean blue 996 C2 Tip pressed into daily service.

Ex '83 W460 LWB G Wagen updated with OM602 engine and 6 speed 'box
Ex. '99 996 C2 manual coupe.
 
  
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Marky911
Indianapolis


Joined: 04 Jun 2009
Posts: 2326



PostPosted: Sat Feb 16, 2019 10:25 pm    Post subject: Reply with quote

Bit of a bodge which I wouldn’t do personally, but you could try some ptfe tape around the threads of the bottle.
It might build the threads up enough to stop the cap threads popping over them when tightened.

Even if it worked though would you be happy setting off on a big trip like that?

It’s a bummer mind. I’ve been considering one of those bottles. £160 vs £350 from Porsche.
It’s the only component in my cooling system that I haven’t renewed.

I think the only “proper” fix is buy a new bottle, or speak to the supplier, but they’re bound to say you’ve done it.
 
  
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ballcock
Sepang


Joined: 21 Jul 2008
Posts: 2959
Location: Dublin

1996 Porsche 993 Carrera 2

PostPosted: Sun Feb 17, 2019 12:01 am    Post subject: Reply with quote

Thanks Marky , I’m a bit p1ssed off that I bothered with the spurious part and should have gone OEM and saved myself a lot of hassle and extra labour Rolling Eyes
Oh well, I’ll prob need to get a new cap again too. If the old one is damaged it’ll screw up the new header tank. Literally.

By the way , it’s more like £400 for the Porsche item, unless you’ve found cheaper?
_________________
'96 Iris C2 vario manual coupe, Koni FZD's/M033's RSR's and HID's.
‘98 Ocean blue 996 C2 Tip pressed into daily service.

Ex '83 W460 LWB G Wagen updated with OM602 engine and 6 speed 'box
Ex. '99 996 C2 manual coupe.
 
  
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Marky911
Indianapolis


Joined: 04 Jun 2009
Posts: 2326



PostPosted: Sun Feb 17, 2019 9:13 am    Post subject: Reply with quote

Morning Ballcock,

£350 was just the price last time I enquired at Porsche but that was a while ago. Obviously you’ll get 10% off by asking your parts guy, unless he’s an ogre. Wink
 
  
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Griffter
Spa-Francorchamps


Joined: 22 May 2016
Posts: 298



PostPosted: Sun Feb 17, 2019 9:15 am    Post subject: Reply with quote

Try a new cap first? Or the old one?
 
  
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ballcock
Sepang


Joined: 21 Jul 2008
Posts: 2959
Location: Dublin

1996 Porsche 993 Carrera 2

PostPosted: Sun Feb 17, 2019 11:33 am    Post subject: Reply with quote

Morning guys, getting a loan of a cap to try first, Thanks Griffter.
Looks like they’re more like £450 at this stage. Plus vat and postage Rolling Eyes

https://www.design911.co.uk/mobile/#part;id=6214

May give local OPC a shout but judging by past performance I could be waiting weeks what
_________________
'96 Iris C2 vario manual coupe, Koni FZD's/M033's RSR's and HID's.
‘98 Ocean blue 996 C2 Tip pressed into daily service.

Ex '83 W460 LWB G Wagen updated with OM602 engine and 6 speed 'box
Ex. '99 996 C2 manual coupe.
 
  
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geoffers
Newbie


Joined: 03 Jul 2013
Posts: 34
Location: Cumbria


PostPosted: Sun Feb 17, 2019 4:06 pm    Post subject: Reply with quote

I bought a pattern part Expansion tank from Car Parts 4 Less for my 3.4 C2 last year.

No particular issues fitting it (with a degree of patience), and it worked a treat

https://www.carparts4less.co.uk/search/205330081

Around £85 delivered, depending on the current discount code.

Cheers
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997.1 C2 Coupe
 
  
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ballcock
Sepang


Joined: 21 Jul 2008
Posts: 2959
Location: Dublin

1996 Porsche 993 Carrera 2

PostPosted: Sun Feb 17, 2019 4:46 pm    Post subject: Reply with quote

Thanks for the info Geoffers.
_________________
'96 Iris C2 vario manual coupe, Koni FZD's/M033's RSR's and HID's.
‘98 Ocean blue 996 C2 Tip pressed into daily service.

Ex '83 W460 LWB G Wagen updated with OM602 engine and 6 speed 'box
Ex. '99 996 C2 manual coupe.
 
  
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Pickse
Spa-Francorchamps


Joined: 20 Jul 2013
Posts: 354
Location: Fleet, Hants


PostPosted: Sun Feb 17, 2019 5:16 pm    Post subject: Reply with quote

I recently had one fitted to my 996T, not sure if it's the same but the deroures site (https://www.deroure.com/partinfo.asp?MAK=3&MDL=25&TBL=2531&SMA=0&SMO=0&ST=99633121900&SC=1&PBID=75482) suggests the same part number 99610615704 is valid for later C2's.
They list it at £86 plus vat plus delivery etc but it will be genuine Porsche.
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Pickse
-----------------
03 Arctic Silver 996T Tip S
Now 9E38 - An improved! 996T
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6506
Location: Brighton


PostPosted: Sun Feb 17, 2019 5:46 pm    Post subject: Reply with quote

Did you check the rubber seal in the cap at all ?

Its only i had something very similar with a brand new cap a few weeks back .. the seal had caught in the threads and wasnt sitting flat .
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ballcock
Sepang


Joined: 21 Jul 2008
Posts: 2959
Location: Dublin

1996 Porsche 993 Carrera 2

PostPosted: Sun Feb 17, 2019 6:57 pm    Post subject: Reply with quote

Hi iain, thanks, yes I checked the seal. It’s flush against the base of the cap. It has been working fine for a number of weeks before it failed.
_________________
'96 Iris C2 vario manual coupe, Koni FZD's/M033's RSR's and HID's.
‘98 Ocean blue 996 C2 Tip pressed into daily service.

Ex '83 W460 LWB G Wagen updated with OM602 engine and 6 speed 'box
Ex. '99 996 C2 manual coupe.
 
  
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6506
Location: Brighton


PostPosted: Sun Feb 17, 2019 8:21 pm    Post subject: Reply with quote

Ok thats good .. well not so actually as it would seem to be the coolant tank Sad

Have a look at the threads and try a different cap .. but im afraid i suspect the tank is at fault .
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My Daughter's Crowdfunding page Here

Mechanic

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Now At An Indy.
 
  
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MisterCorn
Long Beach


Joined: 08 Jan 2011
Posts: 6961
Location: Nottingham, England

2004 Porsche 996 Turbo

PostPosted: Sun Feb 17, 2019 8:25 pm    Post subject: Reply with quote

Pickse wrote:
I recently had one fitted to my 996T, not sure if it's the same but the deroures site (https://www.deroure.com/partinfo.asp?MAK=3&MDL=25&TBL=2531&SMA=0&SMO=0&ST=99633121900&SC=1&PBID=75482) suggests the same part number 99610615704 is valid for later C2's.
They list it at £86 plus vat plus delivery etc but it will be genuine Porsche.


996.2 tanks are a relatively sensible price. 996.1 tanks are not.

MC
 
  
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6506
Location: Brighton


PostPosted: Sun Feb 17, 2019 8:37 pm    Post subject: Reply with quote

MisterCorn wrote:
Pickse wrote:
I recently had one fitted to my 996T, not sure if it's the same but the deroures site (https://www.deroure.com/partinfo.asp?MAK=3&MDL=25&TBL=2531&SMA=0&SMO=0&ST=99633121900&SC=1&PBID=75482) suggests the same part number 99610615704 is valid for later C2's.
They list it at £86 plus vat plus delivery etc but it will be genuine Porsche.


996.2 tanks are a relatively sensible price. 996.1 tanks are not.

MC


OMG .. i just looked up the price for each .. i had no idea Surprised

PAT ?
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Mechanic

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Now At An Indy.
 
  
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ballcock
Sepang


Joined: 21 Jul 2008
Posts: 2959
Location: Dublin

1996 Porsche 993 Carrera 2

PostPosted: Mon Feb 18, 2019 5:49 pm    Post subject: Reply with quote

Just tried a replacement cap, it’s also running on the tanks threads.
New tank then. nooo
_________________
'96 Iris C2 vario manual coupe, Koni FZD's/M033's RSR's and HID's.
‘98 Ocean blue 996 C2 Tip pressed into daily service.

Ex '83 W460 LWB G Wagen updated with OM602 engine and 6 speed 'box
Ex. '99 996 C2 manual coupe.
 
  
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